663491711 has 2 divisors, whose sum is σ = 663491712. Its totient is φ = 663491710.

The previous prime is 663491681. The next prime is 663491749. The reversal of 663491711 is 117194366.

It is a happy number.

It is an a-pointer prime, because the next prime (663491749) can be obtained adding 663491711 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663491711 - 2²² = 659297407 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663491111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331745855 + 331745856.

It is an arithmetic number, because the mean of its divisors is an integer number (331745856).

Almost surely, 2^663491711 is an apocalyptic number.

663491711 is a deficient number, since it is larger than the sum of its proper divisors (1).

663491711 is an equidigital number, since it uses as much as digits as its factorization.

663491711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 663491711 is about 25758.3328458967. The cubic root of 663491711 is about 872.1914677718.

The spelling of 663491711 in words is "six hundred sixty-three million, four hundred ninety-one thousand, seven hundred eleven".